> I still don’t see the problem.
The problem is banks operate in a state of perpetual insolvency. Their ability to pay off their debts to customers depends on the state of the larger economy. Too many defaults and the whole thing comes crashing down.
> At no point is cash conservation broken.
It never existed to begin with. All that's required for the illusion to disappear is for enough people to attempt to withdraw funds at the same time.
> I know that the bank has plenty of other peoples’ $900 that if I wanted that cash I could take it.
The bank has money until it doesn't.
https://en.wikipedia.org/wiki/Bank_run
> Many of the recessions in the United States were caused by banking panics
> The Great Depression contained several banking crises consisting of runs on multiple banks
> The global financial crisis that began in 2007 was centered around market-liquidity failures that were comparable to a bank run
https://en.wikipedia.org/wiki/Financial_crisis_of_2007–2008
> The International Monetary Fund estimated that large U.S. and European banks lost more than $1 trillion on toxic assets and from bad loans
> Lack of investor confidence in bank solvency and declines in credit availability led to plummeting stock and commodity prices
> The crisis rapidly spread into a global economic shock, resulting in several bank failures
> The de-leveraging of financial institutions, as assets were sold to pay back obligations that could not be refinanced in frozen credit markets, further accelerated the solvency crisis
> governments and central banks provided then-unprecedented trillions of dollars in bailouts and stimulus, including expansive fiscal policy and monetary policy to offset the decline in consumption and lending capacity, avoid a further collapse, encourage lending, restore faith in the integral commercial paper markets, avoid the risk of a deflationary spiral, and provide banks with enough funds to allow customers to make withdrawals
People complain about Tether but the whole banking system is just Tether on steroids.